SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f06876ad43eb25231ee1abfbfa2d3fc0e5a118b708d555c27f7e6cd8c69be96' 
  AND token = '7Z3xUjvWFUCrXlCYmrB5q0PjJGZR3Wr/w5u4eIpCD9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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