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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce39c34ee13b4a2f03449fb90f7a471478b969cec62ae6917bafe89c08d24838' 
  AND token = 'WGE9SjM17gB00OhKvXv9k7lgMB5K1QxZYqMYATv2+3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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