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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4e07792c5365b4a7630d2ee196106d8b2b657cec1e2c284c18c08b61ed694f' 
  AND token = 'FZ6M8UpDj0JqAqLsrsV7xi5Nj/NWOAsoLTmk+nFZiOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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