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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a79ba4169283f175436b24040499610995ada4e68fcc460d90a387af510823' 
  AND token = '3NeBFcpN9P+4enral6aYtoYjK6m/cFPP0AjIq/U/3JY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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