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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cb9095d73b212d86d4ae5dbed00132eeec52a55f58379d215fcb9f877ed6f4' 
  AND token = 'ZagRLJpGhEab4UAinVxOv4F7bZ1ef79UiVL3LpJnEpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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