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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd25c584c068f8250ec8b557080bc71e4ac71fb4cc9a1282264f4182f22fcca67' 
  AND token = 'MRlW75S4Yu35LsS27qSnds0AFCXP/E3o2MnrMyAnLF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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