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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8343ebe1f6f4394c0ed7aa5c13455115ab71c76c580f9cfa68926b578879bc8c' 
  AND token = '0fHqx0pPVMRK0FExicaRPjUWRT28ooVl4deJ1qhgBgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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