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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b624ec215ae395df57ada7caea981044522039328ffb0641ab3da918c7e2c7b9' 
  AND token = 'I44NoyDaVQz6Dg4kHojJbgc3PAkSqDlTW1aD/2NFn/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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