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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9b6236c679fcd23efb75ae999c68ba9e7d3824d8ecd81fa8b914d2f49b359c' 
  AND token = 'H6nBxiJmOjsi1bDdkK+ZOq55+Bc5cKzdnZ+7fnCFJi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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