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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2098a8ed6b87ba0c02f5fc476e63707dfef0e972e8eaa3813a0f09fa2e1d1424' 
  AND token = 'tsttNAGLD7l6LDnA7fsib13HRfWX77nkxyRrS9YLbec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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