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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10387340246067c1cadf2945fac12438d157ffc6015a68c7250f780dd1215cfd' 
  AND token = 'ptW/vf3P2OOmSKvAOY6qS0y26deThx2yXLhCye5ezJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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