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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '001c81570b67d5805adb697829378db676a15aaeb18e8d71da8f1eceb149eaba' 
  AND token = 'bEjDJtRPlI+poVXotpb+5O/qur2dJc6uN4xCwpW7VKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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