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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68dd4dcef1c2fcb5d5337fbddc0829f82619584176d55f1ca668857a6a169869' 
  AND token = '1FFd2I60+ptFqGO7/IDXjck7B9BhotaPKipgwbnIaYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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