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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbfd7d833bd6a20c11a5c6a3d10e1a8d1c75acb67b7a34d18f1dcf022713dbcb' 
  AND token = 'z6x4E9jhDt59orZFnW0IUwWyizYIXgGgrYOWked3JjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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