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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '471616e3f34ee7f1ccdc7b43a86b226016447e765a9c3496a8598030bb31ae1a' 
  AND token = 'WyDv7bXQrSrvIXX4/ME1v4PcTMKcspmtqF40L85nmO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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