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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad4a4ee0681d9c2ed34b27ba5a4cbda4de20c4b74dc26bc94ef3dd7871411bff' 
  AND token = 'QOgHBlaiwdRBuAe4HLhxF/2SGD3lkErgu0Y+tq7hso8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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