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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2e4e12db70070c02f710da984753b6ba8146db90cb61181922741efd83f007' 
  AND token = 'lEX9TK9sYNfaoEW51My9N/xLXuvVNsNvkU/KUE+GJ/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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