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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc65e63f6b92c76a020f479af6e36aaff8b64fd7a50b5b5aac7564e79aa05538' 
  AND token = 'i6a6jGaeErFufmWeKIOwu0PHWvo2/KK3RxKNaBcvRaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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