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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d28a1ad5ddcd55e537b6afcafc202b58f0701036c1c41834118710a72cf3f2b' 
  AND token = 'lE6Wagxu9h25BTBkY1fog5XHIkJwo17iSSGj7ypcd50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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