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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11daa9e01fd52352bed2beab9799374d80ca99ea8ef441d56dc62616d0e80ad9' 
  AND token = 'QHvaOS21RGE0RqKulfpIX6B5u/1WIOugAQzpQLC2jS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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