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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e650517724a52ea25f77923ff20bbaa9cbbf49810e9a4776464cf0431ffdc8b2' 
  AND token = 'iirBol7IghfSBYBOKjYkptAjYyZapCmANd+eKtiNYX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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