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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8c3bccef1e97efedfc180c4aaa6d5c255bb42f1a20b9e62c7ddbf0962acc33' 
  AND token = 'Z154Pvz8+0pHuLMp7SyB8NQzEf/gZsfpqnb3a2IXHwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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