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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79462cdc891c3e011310ef30c400d002ce9b5c4b0d8796b6beac5d14e5dad56c' 
  AND token = 'd1aaafOpcBD2MVXDD6HeuLy1to4Yr5kKz6zkZU39fW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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