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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f9ef10b476e79860bde6bc66c541e65e378b21546b6c486961e9dfcf8d040dc' 
  AND token = '+JJdgMDlzOjKepeJ8cz2P1qZDp5jFtdPwE7VeVZ06AA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00507

JSON explain

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