SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '164da87155c76571bf3ac9cb0e677ed814afc8689ce4915a312325f19dc16e02' 
  AND token = 'vadHbN/3oXDZKeGGMdTIY9MrTE1gsYCwhAGmdqPFh1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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