SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb9b57db022cd09446d18ecc80db365f084eaf9f2345d172a1855824faedb92' 
  AND token = 'TLLChERHLvqGUSBtZq1+WdYc/96p7O/rnSPV2Vo05rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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