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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c2d6eba99cec17f080f7aff4a710c0cdacdcdb651ee314fb2b0ba4870543dca' 
  AND token = 'y2E+6YDaTfedFFhGUEmmni5KaoUEJawGXcZux6shl4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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