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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a6dbe9e63bcf9f4e9799f5423f1eb7feb60815dd309d92ab298d55d6391fa9' 
  AND token = 'VmpZmfZNF6oNdiW0dETwsj24gPjerK13P7GDkvR58mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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