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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '640b32a9924bf9050db970567e8aad518277bbb21a6d2a7231a9451a9e861634' 
  AND token = 'hlef0GDO85XuTc7ubvV+KjFDMl4HOZIapx5iL8jlbpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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