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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fdd099110fb76f2343c0df15ef2939b5bf7e9a12864b6e00cd478354e548e00' 
  AND token = 'dLhehxr+h2QNZDC0Vji2QmzezheXWj+krpGA/GTB3os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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