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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '106275092ebf80a957c5d6551ae8c12f4b34d1059cafd1b0caa3488d73a0f58e' 
  AND token = 'wyrY/XFH97xz1P85AVl6fLS2sh3POfsOq+9qL79mafI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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