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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '522e48e8499955b27e0b190651d468c6eb3d9e635516ce5bbec73b28d635aa32' 
  AND token = 'Q7GDpDOWeD3rO/00+tHSZzNhNm1n+BQQ9PRyHGblDnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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