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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78163e4ac48abb92afe2db4843806124780b5931ea4532b3dbfb92e9c52195ee' 
  AND token = 'rDuWN5+TYUOW/JQ7wb7bKIBWJQ0SavtHQ9OZjMrlOlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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