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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6005cb55e58201fd7c5e0b6cf968f0fa4d3602fcb0bd6f99447347bb40e8d4ff' 
  AND token = 'nrNleceqVRfpY/p56LfK+FShBeDkQtK+LG93HE5iDDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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