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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c64c445b9ecd93f3720fc675ce147f6da1969c2f8cae46785ef41aeac968c8' 
  AND token = 'kFsdIYMD7WLUaZEGiQ0EY6jcp3SKIGDZmj5av31b2uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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