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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '103580306fb63bcfef9ea40297bde63705c3d0e678cb38f1fe38231ec0818ff9' 
  AND token = 'WRwXmrxVA6jbk6Um2VOki0ev8RjdijrS7NBAv/u6va4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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