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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf82c69eee0ae8f5b03e97ee0e248b7eef173a7f312e1003360ee8775cb7e512' 
  AND token = 'glwJspWVk67DSQrC7b7BXUGb2dvmz0+bRtaOLy+BAT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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