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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e17562f1be7ec81a6892bfb7a97546b9ea393996f8ea7b56bb03f94eb44779c0' 
  AND token = 'cyjk6Z1v3fbHIhTyvCvaPK7psGPm5OOe2eOSTxS3WBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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