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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd57d7e1cfec5478a65a11497294f12030c9f3d0bd072b386b20e8a78fa58b0d' 
  AND token = 'wsB2krQFxgd6p2rB03ZwXS9LkQWv5CNdsCSoZTx6Tgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00110

JSON explain

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