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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d7ad26f6a95e60f933a565c5ae270c4cd651bb4ed32f2203d0924bdad34b471' 
  AND token = 'lyv4K4shbFT8hnjn4pM03dwhUWkjzZWKaNxZ45jYAtY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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