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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a67230b4cb19ae8b178761c7b76558f40bbb1503aa7c27129e141c0000be22' 
  AND token = 'gePN5sJx3MDPkdN6A9WdL3GZtiP57pFst/6lr+vzw7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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