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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28a2a8edc09626a49d2166a82149552cf7728462c9f401eadde1e75da5ba052b' 
  AND token = 'rFzKlWwF8jfoyJ/f9+LoxDRkGI5j1fo51HIg532UHWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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