SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14f1e43f85c3adadb264124dce7725a4fc1aa64f38dd916aca695118b813489' 
  AND token = '0ugBIYlsZnzpJRp3tkOAqnG06n4n6R2hhHxmwME+wJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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