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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3c533892cb54a981591aca6009a708effb41452b8d4cdd6b2fe22e1ef6ce96' 
  AND token = '5d2ZHV5fojFA3X5AzR28cezxRIA9c+qZEY8MA14LcHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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