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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b9f339a10052a9ccd8f33d7a5a13d55f19d8af92683c71e23bd4a3ecd03691' 
  AND token = '4RHmnk02lhGdJRVJijCYgT8wocnwj3o4GO4TbRln9Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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