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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23bfa9900aa993f8976f702b093b7a53117b6f3e6cc9fa9f675ec8a5709f8e42' 
  AND token = 'vBOpxbgfTUgUF5gkSMfrExlDGvUaZ9Q7rXkO7ubc7mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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