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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d4351d70bc680a14ffb849f4dae63d11674b8e7284ad9275b99527e32fb7966' 
  AND token = 'PAslV5zq5diU5AFSIJVAwPGs77POss5yGOaEkLcelHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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