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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aca3accd721e71401b25fa755bef31652d2d8a6dae0c634457e4ebf41d51638' 
  AND token = 'ojbK318hm4fzwLnh6KLtUH3Sr4lqK2E+7i8IW2fepVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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