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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43a04ca8501c79645b386d517c90385c8b6825e890704452a1a8f924fa16f646' 
  AND token = 'hylQlxZYqrUy1Ae2D7y+iiCyKTTPxyb2knqhZxFxpGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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