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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fb3e8c7ae12eab0c3450f53836e90eb46259a680b4fc36d4303e6cd351e04bf' 
  AND token = 'wlYFcPIp7N8wwNg98Y4YGkUXlqCvaXnT/ikBp42VDt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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