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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b131682c9915e6bec464eb121ce9964f7db328fa1f83b1b7e5e7f11764ad061' 
  AND token = 'IXlMlUYjg210klmvl4jsBIKuT1IFo+BkN/I570wW/AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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