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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a72049090e0ff238ec248b22d1eef8f636b638f31d4adf307f64b676cd1ccb13' 
  AND token = 'yj4pdtTxLKt86ivjRmyxXG78hebUv6Hb8LTlIubK8JM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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