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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc01d67541c21dd94098447f55b244d2f5c02a3e1550d5d3fe368154a8c93e0c' 
  AND token = 'IO0KtZBVfzbG4a+0aFok3967Fl/2z7hlYdJfU8tUavc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}