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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c641e11d3b5aeaebc81d50a9e8497ef03316b06c1feb5523b559094add2517' 
  AND token = 'WMjo8waDrY3bEcvW8lD7luMerGaCiLMVLDHZ2zvVOo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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