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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a4acb15ae5a0d0fb97b67fe5d245acb56f8dc7e690ace20dfb825bed38d28fa' 
  AND token = '9v6ucSLu65tdRa+JzcGu64uuiAohnrCR7kipgqxfl/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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