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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a539d6ae9c14640a4cac8107d4b6f7e54bff7bcd5d6b0c3250d4a38ed9d8d805' 
  AND token = 'sXCaRG3Le/5ZFah1NWdZ+eMWLCRwkbif1fOu9Wugmig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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