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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c531d8fc5c524f06845f3bab0e6215e72f67730cbfabf5e927ffc61b3d892a3' 
  AND token = 'y6/PVmGgl093hOnNEuVzP6Peagn+ZeAb0E+RAv/aDQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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