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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cdda663646efb4dee211e2dc8fd61be1af4da588c56f07245e25794860e72f' 
  AND token = 'N3X8aOCQaEWi+6Qx5zDvNUof/3XOJrq94vfdYAiFC4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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