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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69fa446543664b44c77079189bd2fabf6812ed9cf2ca70217a19e1daf1b8f83a' 
  AND token = '/Ia2cbI1NfGZxDUTldbCSfyOE19sHYlMgNmYX+NKHiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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