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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbd895e003556a08caeb138a60b02c414c5abc31413f983367674e2d43cdff6e' 
  AND token = 'v40hvqnwl09wea+H5dU91lhTlH80XWBDh3jNlqT/e38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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