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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '563351fe09af86a6a5d68355507b7850b3f48abe4893a356392a3dded1299b34' 
  AND token = '9wnWTgldpxiD0kI1/Haz2Gl4hY2EAo+9jHSaAwlQcKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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