SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc81d40590bc3650550b8535e71fca4073545c8dc5b9814756e94c0f984b0110' 
  AND token = 'mwitL42uVr6RIGy7nLoTAqaYoVaehAnCwNJPvKUqggQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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