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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaf6cd2463ec4f7c8b30b8d973d91d2a4ce22455cf4b096c38d616245014e4c5' 
  AND token = 'DTjTs6qw+APF6BVdoKQFC8pG6al3l3MZ4aXBdel5edQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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