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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b7ef1aa7e7c0ca84cdd8da809a2608b38cfb712ba3d6c35639e2060673455d4' 
  AND token = 'MWyuD40XHbM0b1bfx2K4OYt+y8l2LmACyUiDy1JqKeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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