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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59c79ff189be94258b307e41f3471864f58e1e492b081331e220648601bca36a' 
  AND token = 'FaOmJf5wCY/iaVxlGUQQqNkFbkU0hGY9ORp1nkLyV2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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