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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6208593e6fe1fad9d5cc092f5b76e09258d5593e348f81d9449c828781883a7' 
  AND token = 'hpX7Ntw/AMILhHn7GtIoCigezXC+9buzWZkkatEpGlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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