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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf8fb04a3a3fd8e21edc0c4a6adcd4593269298cd7a5bd49c77a3bebc7f636d1' 
  AND token = 'CSCSqBccE7WkE62HA65Aw0Hx3xwoZj7dtzPyeRSUbXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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