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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e0cc9ef9eb93bc18016feb7f2f4ea43075ebd4ff2ff00c128891103670adb0' 
  AND token = 'QV++lyXzh6p/N/MOe9911/nziSz7hnyzi6h0fnj5o2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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