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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b7fc12290cb97a5ab91c94e7f7a391604bbae9153f50b65481b9904f427bb20' 
  AND token = '3SOkee9s/yULW4QJnt2EToY4zip6l3/V7C0C2fYQPi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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