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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f39f30bc29d782502f18dd38d13460b64f4d029af13a9c83ffb1f08a39075d0' 
  AND token = 'px5LRAu8enTgWuDA6LFCEoc8xNtYq4oxRPGYUN/gB64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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