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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bedc8340d28729ebf2c39dbd6ae15ef6d86cfd7861b5185cfc080afbc8c1b7' 
  AND token = 'XBU299kzdRF13S05Y6Zdbuu9KfMqabMLCy6Qd/xJT5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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