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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'daaea80d1691ec30d8cd3727a6a45c8e1b4bf7b93b7df61a939c7ea14f76e3e9' 
  AND token = 'mwehgOC+SXYNc8HZN5UGG6oIQ2VyP51uF1XcEYHBl3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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