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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401727c7928c7d1f624b28bbfe85940394f170608c463d70fb1e4931a589c274' 
  AND token = 'YXe8IK/02Gsjkk/9cI8ay9qD/yVq7/E6j1HfqP27rJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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