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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '822d0becd1d07011abaccf2c17b7e0a8014c1a9ba471357c143edf7be506953b' 
  AND token = 'bz4d0ijyOlwbartsV9Qmq/Vvn78KAZM85ASuflOJ3u4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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