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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ffe448de5bfccf79e8dd2d46fc2dda8f97146c17a6268ad46f05f3e9afe56f' 
  AND token = 'AGxlypWnuE+OGyICrpqxoBD3QIH3f/+slYSjuUaSlOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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