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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbe24fc3d31097d801abe873f71225f9075cee25cc54a327946c27925fb3d6ec' 
  AND token = 'L9Ck9Cf0zyTUkeI3y5nfdDUWgG7I5PUtiW85779Iua4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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