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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f03a083d578ebc4b8a8aecf8b8c9fee538e8737187efbd77de8db0a57e3dc09' 
  AND token = 'g6Tjexw8UPLogUEcKs5jgoIlHLYMOvPZby0Dw8PwDbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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