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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b10a7075cb672fe8b53557a57132a9ec5dc2d8c3e5ff7f42d555727c2667d27' 
  AND token = 'f9p5gOGifI/0QaiJQQ8RX4Tdt5+RN+SS58iNqlv0Z5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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