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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69d3f13ff328c9fcc4d4e9957824dc350c258b018533413b753184ec025956c1' 
  AND token = 'K8MLLhHpz9PG7jE9JMXr7fkrpN2yZu15Vo8rVlRbZDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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