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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10b03bbf81c363290486ac7d5ecf1f3e39153f8275e2bf7e5f147066e39369dc' 
  AND token = 'kU/N7zrfVfFm8ltJnQAeOhfZBt8z8zXnog9DxiLTk/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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