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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478a4b3eb6460c6c6681c9da332a533eeef5adb6baeb57937f5c5447cd2bcc19' 
  AND token = 'Ke4hBKEBfHnDyOiaoRkKjgynO/E5nCbUu36Y1SMBQNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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