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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c482fa17dc58e63aebb3e7ddf395303180f373dd05c7a08afbbd5664eb9cfe55' 
  AND token = 'eQ0ZOXMGR41mTiw7OK7Eew7P5U4n5WX3pL7Rzzpb4zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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