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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff567d1698a93accb4605845f8e8c41bb1faddf174e1381e01b6428c3ddee49' 
  AND token = 'D/o50CszG6X4WsmPUQUAcC+dKbuEfQl3enWFQafgfqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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