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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f9cc673709cc4bb4dcc1d35ff811eb1c96dc408e28c5e3ce47382065fff22e' 
  AND token = 'dgM8eECO/uc4BdtL1WxyqxRWEaav+LTw4dXx+9OpMwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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