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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c113b4c90bbad6b5f5cffe1e9c4d81ae32f6444329f953b51bd00a2173159755' 
  AND token = '3OQ2JbGByFJjbqExt6BrUqistkc7lTXl3ox1JeLOOqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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