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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a666faa6e0965905413d5d6a93d2a667eeb7dffc406cbd1cf3d72a21274b9b' 
  AND token = '4Q/N19aR61FF20z/3l9XtbmlX+F7CUMqREs0XHE+8eY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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