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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e200bf38d03a8deec319f8d23a686bda13a24eb15fd405b84b98f10e80a7e68' 
  AND token = 'Wo4QUuLhpZQqoakSvltJ5Afr7xJzT0oy1EGB9h34F30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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